Improvement in self-facing check-valves



`C. HUE 8L' J. H. KNIGHT..

Improvement in Self-Facing Check-Valves.

No. 126,235. PatentedAp,ri|so,1a72.

Figi

Nimh STATES CHARLES RUE AND JONAS LII. KNIGHT, 0F DoYLnsToWN, PENNSYLVANIA.

INlPROVEIVlEN'I lN SELF-:FACING CHECK-VALVES.

. Speciiication forming part of Letters Patent No. 126,335, dated April 30, 187:2.

of a hardmetal check-valve with a soft-metal seat or base, or a soft-metal check-valve-with a. hard-metal seat or base, the effect of the combination being that the hard metal of the one part wears true the soft metal of the other part, forming a perfect and true joint.

To enable others skilled in the art to make and use our invention, we will describe its construction and Inode of operation.

ln the drawing, A is`the cage. A are the openings in the cage to allow the incoming water to enter the boiler; B, the check-valve; C, the seat or base, which is stationary and fixed; D, the opening to admit steam against the top of the checlcvalve B. The valve shown is a check-'valve for introducing water into boilers, and is of the same `construction as to the shape and design of the valve, cage, and seatv as the ordinary brass valves in common use,

the great defect with which valves has been that after running a short time the check-valve B has worn on the seat C unevenly, causing a leak of steam backto the pump, in which case the pump will not work, and the valve and pump become utterly worthless, forcing the engineer to rely wholly on the injector.

The operation of these valves is as follows: To the bottom of the seat or base C is attached a water-pipe, E, which throws the water up into the valve. The valve, being on the outside of the boiler, is connected, by a short pipe, with the outside shell of the boiler, and the said water-pipe E is connected with a pump, which forces the water into the valve. At

every stroke of the pump the water is forced through the pipe E in the direction of the arrow F against the check-valve B, which is lifted by the force of the water until it strikest, e top of the cage A, and the inflowin g water escapes at the point H through the openings A in the cage Ainto the water inside ofthe boiler, and, as the force from the pump is only momentary, the check-valve B is only sustained forv a short time, and is immediately forced down again by the pressure of the steam in the boiler, exerted through the opening D in the top of the cage A, in the the direction of the arrow G. The steam and Water in the-boiler are thus prevented from escaping so long as the lower face of the check-valve B is true and even. There' is thus a constant wear of the lower face of check-valve B on the upper face of the stationary seat C at the point H, and in practice these faces, in the valves in common use, soon become so unevenly worn as to allow of the escape and leakage of the water and steam already in the boiler, which escape through the Water-pipe into the pump and stop its working, causing great delay and danger,

the only reliance in such case being the injector, 1

changing the nature and object of the inven.

tion. Thus it may be made square, polygonal, 85e. It will be perceived that neither a revolving, a sliding, a hinged, nor a ball valve, nor anyother valve than of the character Specifically described, can be regarded as comprehended in the present invention, the action of the metals in all these being different from the present, in which the two metals meet forcibly in line and mutually form a perfect fit, just as do male and female dies used in strikin g up a compressible material, insomuch that such dies and all other analogous processes are believed to present closer analogies to this invention than do valves of any other construction. As the valve and its seat are generally counter- ATEN'r raros,

parts, and generally annular in shape, it is not A cup-formed check-valve, thebrim of which regarded as essential to guard either from antagouises with a seat, when the valve and changing position by rotating or moving upon its seat are of different degrees of compressits axis, though this may be done by the use bility, substantially as described.

of guides in perfect harmony With the theory CHARLES RUE.

of the invention. JONAS H. KNIGHT.

Having thus described our improvement,. Witnesses:

what We claim as new, and desire to secure WM. H. HOOD,

by Letters Patent, is- A NVM. R. HEINs. 

